1) Reduce cooldown of Benediction to 3 minutes (5 minutes is just too long)
2) Up the proc rate on Cure II/III (Just to help with sustain). Also, increase the radius on Cure III a little, maybe up to 8y.
3) Up the magic return of Assize to 15% and reduce cooldown timer to 1 minute (more sustain help)
4) Have Asylum increase skill/spell speed for everyone inside (AST and SCH bubbles reduce damage, with AST also having a Regen effect while SCH's bubble is twice the size of AST or WHM bubbles, so give WHM something different while also giving WHM more group utility)
5) Make Aero I/II unmissable
6) Make using Stone I/II/III have a chance at triggering a free Stoneskin cast (Because 99% of players still won't bother to apply SS outside of battle or during a prey mechanic.)

Take what you will from this. It was written at 6am and I haven't gotten a wink of sleep so a lot of this might be way off base